|Scanned geologic maps of North Carolina|
|This page provides links to scanned geologic maps of
North Carolina (including the 1985
Geologic Map of North Carolina), a disclaimer about map accuracy,
and a user's guide to finding geologic maps in the National
Geologic Map Database (NGMDB).
Three categories of geologic maps currently available.
The "1985 Geologic Map of North Carolina," the "Generalized Geologic Map of North Carolina," and other maps are available here.
The geologic maps that appear on this site at the present time were scanned at 300 dpi from folded paper maps that have been published. The scanning resulted in .tiff files that were subsequently compressed using Mr. Sid® technology (http://www.lizardtechnology.com) to produce Mr. Sid files (.sid format). The .sid files were georegistered using ArcMap® version 8.2. The computer program Corpscon was used to determine UTM coordinates that were used by ArcMap® to produce "world files" (.sdw format) needed to geospatially display the images with geographic information system (GIS) software.
Users should carefully note that the entire process described produces georegistered map whose geographic positions are generally accurate. However, owing to paper map folds, possible stretching in the scanning process, and other factors such as shrink/swell of the paper from humidity, temperature, age, etc., these scanned maps may not be as accurate as the original map.
Interested parties should refer to the original document that may contain printed information or data not included here.
For additional information
|Last Modified: October 3, 2003|